1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7 /*- 8 * Copyright (c) 1982, 1986, 1989, 1993 9 * The Regents of the University of California. All rights reserved. 10 * (c) UNIX System Laboratories, Inc. 11 * All or some portions of this file are derived from material licensed 12 * to the University of California by American Telephone and Telegraph 13 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 14 * the permission of UNIX System Laboratories, Inc. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94 41 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95 42 * $FreeBSD$ 43 */ 44 45 #include "opt_suiddir.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/fcntl.h> 51 #include <sys/filio.h> 52 #include <sys/stat.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/endian.h> 56 #include <sys/priv.h> 57 #include <sys/rwlock.h> 58 #include <sys/mount.h> 59 #include <sys/unistd.h> 60 #include <sys/time.h> 61 #include <sys/vnode.h> 62 #include <sys/namei.h> 63 #include <sys/lockf.h> 64 #include <sys/event.h> 65 #include <sys/conf.h> 66 #include <sys/file.h> 67 #include <sys/extattr.h> 68 #include <sys/vmmeter.h> 69 70 #include <vm/vm.h> 71 #include <vm/vm_param.h> 72 #include <vm/vm_extern.h> 73 #include <vm/vm_object.h> 74 #include <vm/vm_page.h> 75 #include <vm/vm_pager.h> 76 #include <vm/vnode_pager.h> 77 78 #include "opt_directio.h" 79 80 #include <ufs/ufs/dir.h> 81 82 #include <fs/ext2fs/fs.h> 83 #include <fs/ext2fs/inode.h> 84 #include <fs/ext2fs/ext2_extern.h> 85 #include <fs/ext2fs/ext2fs.h> 86 #include <fs/ext2fs/ext2_dinode.h> 87 #include <fs/ext2fs/ext2_dir.h> 88 #include <fs/ext2fs/ext2_mount.h> 89 #include <fs/ext2fs/ext2_extattr.h> 90 91 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 92 static void ext2_itimes_locked(struct vnode *); 93 static int ext4_ext_read(struct vop_read_args *); 94 static int ext2_ind_read(struct vop_read_args *); 95 96 static vop_access_t ext2_access; 97 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 98 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 99 struct thread *); 100 static vop_close_t ext2_close; 101 static vop_create_t ext2_create; 102 static vop_fsync_t ext2_fsync; 103 static vop_getattr_t ext2_getattr; 104 static vop_ioctl_t ext2_ioctl; 105 static vop_link_t ext2_link; 106 static vop_mkdir_t ext2_mkdir; 107 static vop_mknod_t ext2_mknod; 108 static vop_open_t ext2_open; 109 static vop_pathconf_t ext2_pathconf; 110 static vop_print_t ext2_print; 111 static vop_read_t ext2_read; 112 static vop_readlink_t ext2_readlink; 113 static vop_remove_t ext2_remove; 114 static vop_rename_t ext2_rename; 115 static vop_rmdir_t ext2_rmdir; 116 static vop_setattr_t ext2_setattr; 117 static vop_strategy_t ext2_strategy; 118 static vop_symlink_t ext2_symlink; 119 static vop_write_t ext2_write; 120 static vop_deleteextattr_t ext2_deleteextattr; 121 static vop_getextattr_t ext2_getextattr; 122 static vop_listextattr_t ext2_listextattr; 123 static vop_setextattr_t ext2_setextattr; 124 static vop_vptofh_t ext2_vptofh; 125 static vop_close_t ext2fifo_close; 126 static vop_kqfilter_t ext2fifo_kqfilter; 127 128 /* Global vfs data structures for ext2. */ 129 struct vop_vector ext2_vnodeops = { 130 .vop_default = &default_vnodeops, 131 .vop_access = ext2_access, 132 .vop_bmap = ext2_bmap, 133 .vop_cachedlookup = ext2_lookup, 134 .vop_close = ext2_close, 135 .vop_create = ext2_create, 136 .vop_fsync = ext2_fsync, 137 .vop_getpages = vnode_pager_local_getpages, 138 .vop_getpages_async = vnode_pager_local_getpages_async, 139 .vop_getattr = ext2_getattr, 140 .vop_inactive = ext2_inactive, 141 .vop_ioctl = ext2_ioctl, 142 .vop_link = ext2_link, 143 .vop_lookup = vfs_cache_lookup, 144 .vop_mkdir = ext2_mkdir, 145 .vop_mknod = ext2_mknod, 146 .vop_open = ext2_open, 147 .vop_pathconf = ext2_pathconf, 148 .vop_poll = vop_stdpoll, 149 .vop_print = ext2_print, 150 .vop_read = ext2_read, 151 .vop_readdir = ext2_readdir, 152 .vop_readlink = ext2_readlink, 153 .vop_reallocblks = ext2_reallocblks, 154 .vop_reclaim = ext2_reclaim, 155 .vop_remove = ext2_remove, 156 .vop_rename = ext2_rename, 157 .vop_rmdir = ext2_rmdir, 158 .vop_setattr = ext2_setattr, 159 .vop_strategy = ext2_strategy, 160 .vop_symlink = ext2_symlink, 161 .vop_write = ext2_write, 162 .vop_deleteextattr = ext2_deleteextattr, 163 .vop_getextattr = ext2_getextattr, 164 .vop_listextattr = ext2_listextattr, 165 .vop_setextattr = ext2_setextattr, 166 .vop_vptofh = ext2_vptofh, 167 }; 168 169 struct vop_vector ext2_fifoops = { 170 .vop_default = &fifo_specops, 171 .vop_access = ext2_access, 172 .vop_close = ext2fifo_close, 173 .vop_fsync = ext2_fsync, 174 .vop_getattr = ext2_getattr, 175 .vop_inactive = ext2_inactive, 176 .vop_kqfilter = ext2fifo_kqfilter, 177 .vop_print = ext2_print, 178 .vop_read = VOP_PANIC, 179 .vop_reclaim = ext2_reclaim, 180 .vop_setattr = ext2_setattr, 181 .vop_write = VOP_PANIC, 182 .vop_vptofh = ext2_vptofh, 183 }; 184 185 /* 186 * A virgin directory (no blushing please). 187 * Note that the type and namlen fields are reversed relative to ext2. 188 * Also, we don't use `struct odirtemplate', since it would just cause 189 * endianness problems. 190 */ 191 static struct dirtemplate mastertemplate = { 192 0, 12, 1, EXT2_FT_DIR, ".", 193 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 194 }; 195 static struct dirtemplate omastertemplate = { 196 0, 12, 1, EXT2_FT_UNKNOWN, ".", 197 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 198 }; 199 200 static void 201 ext2_itimes_locked(struct vnode *vp) 202 { 203 struct inode *ip; 204 struct timespec ts; 205 206 ASSERT_VI_LOCKED(vp, __func__); 207 208 ip = VTOI(vp); 209 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 210 return; 211 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 212 ip->i_flag |= IN_LAZYMOD; 213 else 214 ip->i_flag |= IN_MODIFIED; 215 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 216 vfs_timestamp(&ts); 217 if (ip->i_flag & IN_ACCESS) { 218 ip->i_atime = ts.tv_sec; 219 ip->i_atimensec = ts.tv_nsec; 220 } 221 if (ip->i_flag & IN_UPDATE) { 222 ip->i_mtime = ts.tv_sec; 223 ip->i_mtimensec = ts.tv_nsec; 224 ip->i_modrev++; 225 } 226 if (ip->i_flag & IN_CHANGE) { 227 ip->i_ctime = ts.tv_sec; 228 ip->i_ctimensec = ts.tv_nsec; 229 } 230 } 231 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 232 } 233 234 void 235 ext2_itimes(struct vnode *vp) 236 { 237 238 VI_LOCK(vp); 239 ext2_itimes_locked(vp); 240 VI_UNLOCK(vp); 241 } 242 243 /* 244 * Create a regular file 245 */ 246 static int 247 ext2_create(struct vop_create_args *ap) 248 { 249 int error; 250 251 error = 252 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 253 ap->a_dvp, ap->a_vpp, ap->a_cnp); 254 if (error != 0) 255 return (error); 256 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 257 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 258 return (0); 259 } 260 261 static int 262 ext2_open(struct vop_open_args *ap) 263 { 264 265 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 266 return (EOPNOTSUPP); 267 268 /* 269 * Files marked append-only must be opened for appending. 270 */ 271 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 272 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 273 return (EPERM); 274 275 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 276 277 return (0); 278 } 279 280 /* 281 * Close called. 282 * 283 * Update the times on the inode. 284 */ 285 static int 286 ext2_close(struct vop_close_args *ap) 287 { 288 struct vnode *vp = ap->a_vp; 289 290 VI_LOCK(vp); 291 if (vp->v_usecount > 1) 292 ext2_itimes_locked(vp); 293 VI_UNLOCK(vp); 294 return (0); 295 } 296 297 static int 298 ext2_access(struct vop_access_args *ap) 299 { 300 struct vnode *vp = ap->a_vp; 301 struct inode *ip = VTOI(vp); 302 accmode_t accmode = ap->a_accmode; 303 int error; 304 305 if (vp->v_type == VBLK || vp->v_type == VCHR) 306 return (EOPNOTSUPP); 307 308 /* 309 * Disallow write attempts on read-only file systems; 310 * unless the file is a socket, fifo, or a block or 311 * character device resident on the file system. 312 */ 313 if (accmode & VWRITE) { 314 switch (vp->v_type) { 315 case VDIR: 316 case VLNK: 317 case VREG: 318 if (vp->v_mount->mnt_flag & MNT_RDONLY) 319 return (EROFS); 320 break; 321 default: 322 break; 323 } 324 } 325 326 /* If immutable bit set, nobody gets to write it. */ 327 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 328 return (EPERM); 329 330 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 331 ap->a_accmode, ap->a_cred, NULL); 332 return (error); 333 } 334 335 static int 336 ext2_getattr(struct vop_getattr_args *ap) 337 { 338 struct vnode *vp = ap->a_vp; 339 struct inode *ip = VTOI(vp); 340 struct vattr *vap = ap->a_vap; 341 342 ext2_itimes(vp); 343 /* 344 * Copy from inode table 345 */ 346 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 347 vap->va_fileid = ip->i_number; 348 vap->va_mode = ip->i_mode & ~IFMT; 349 vap->va_nlink = ip->i_nlink; 350 vap->va_uid = ip->i_uid; 351 vap->va_gid = ip->i_gid; 352 vap->va_rdev = ip->i_rdev; 353 vap->va_size = ip->i_size; 354 vap->va_atime.tv_sec = ip->i_atime; 355 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 356 vap->va_mtime.tv_sec = ip->i_mtime; 357 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 358 vap->va_ctime.tv_sec = ip->i_ctime; 359 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 360 if E2DI_HAS_XTIME(ip) { 361 vap->va_birthtime.tv_sec = ip->i_birthtime; 362 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 363 } 364 vap->va_flags = ip->i_flags; 365 vap->va_gen = ip->i_gen; 366 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 367 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 368 vap->va_type = IFTOVT(ip->i_mode); 369 vap->va_filerev = ip->i_modrev; 370 return (0); 371 } 372 373 /* 374 * Set attribute vnode op. called from several syscalls 375 */ 376 static int 377 ext2_setattr(struct vop_setattr_args *ap) 378 { 379 struct vattr *vap = ap->a_vap; 380 struct vnode *vp = ap->a_vp; 381 struct inode *ip = VTOI(vp); 382 struct ucred *cred = ap->a_cred; 383 struct thread *td = curthread; 384 int error; 385 386 /* 387 * Check for unsettable attributes. 388 */ 389 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 390 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 391 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 392 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 393 return (EINVAL); 394 } 395 if (vap->va_flags != VNOVAL) { 396 /* Disallow flags not supported by ext2fs. */ 397 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 398 return (EOPNOTSUPP); 399 400 if (vp->v_mount->mnt_flag & MNT_RDONLY) 401 return (EROFS); 402 /* 403 * Callers may only modify the file flags on objects they 404 * have VADMIN rights for. 405 */ 406 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 407 return (error); 408 /* 409 * Unprivileged processes and privileged processes in 410 * jail() are not permitted to unset system flags, or 411 * modify flags if any system flags are set. 412 * Privileged non-jail processes may not modify system flags 413 * if securelevel > 0 and any existing system flags are set. 414 */ 415 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 416 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 417 error = securelevel_gt(cred, 0); 418 if (error) 419 return (error); 420 } 421 } else { 422 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 423 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 424 return (EPERM); 425 } 426 ip->i_flags = vap->va_flags; 427 ip->i_flag |= IN_CHANGE; 428 if (ip->i_flags & (IMMUTABLE | APPEND)) 429 return (0); 430 } 431 if (ip->i_flags & (IMMUTABLE | APPEND)) 432 return (EPERM); 433 /* 434 * Go through the fields and update iff not VNOVAL. 435 */ 436 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 437 if (vp->v_mount->mnt_flag & MNT_RDONLY) 438 return (EROFS); 439 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 440 td)) != 0) 441 return (error); 442 } 443 if (vap->va_size != VNOVAL) { 444 /* 445 * Disallow write attempts on read-only file systems; 446 * unless the file is a socket, fifo, or a block or 447 * character device resident on the file system. 448 */ 449 switch (vp->v_type) { 450 case VDIR: 451 return (EISDIR); 452 case VLNK: 453 case VREG: 454 if (vp->v_mount->mnt_flag & MNT_RDONLY) 455 return (EROFS); 456 break; 457 default: 458 break; 459 } 460 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 461 return (error); 462 } 463 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 464 if (vp->v_mount->mnt_flag & MNT_RDONLY) 465 return (EROFS); 466 /* 467 * From utimes(2): 468 * If times is NULL, ... The caller must be the owner of 469 * the file, have permission to write the file, or be the 470 * super-user. 471 * If times is non-NULL, ... The caller must be the owner of 472 * the file or be the super-user. 473 */ 474 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 475 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 476 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 477 return (error); 478 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 479 if (vap->va_atime.tv_sec != VNOVAL) { 480 ip->i_flag &= ~IN_ACCESS; 481 ip->i_atime = vap->va_atime.tv_sec; 482 ip->i_atimensec = vap->va_atime.tv_nsec; 483 } 484 if (vap->va_mtime.tv_sec != VNOVAL) { 485 ip->i_flag &= ~IN_UPDATE; 486 ip->i_mtime = vap->va_mtime.tv_sec; 487 ip->i_mtimensec = vap->va_mtime.tv_nsec; 488 } 489 ip->i_birthtime = vap->va_birthtime.tv_sec; 490 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 491 error = ext2_update(vp, 0); 492 if (error) 493 return (error); 494 } 495 error = 0; 496 if (vap->va_mode != (mode_t)VNOVAL) { 497 if (vp->v_mount->mnt_flag & MNT_RDONLY) 498 return (EROFS); 499 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 500 } 501 return (error); 502 } 503 504 /* 505 * Change the mode on a file. 506 * Inode must be locked before calling. 507 */ 508 static int 509 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 510 { 511 struct inode *ip = VTOI(vp); 512 int error; 513 514 /* 515 * To modify the permissions on a file, must possess VADMIN 516 * for that file. 517 */ 518 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 519 return (error); 520 /* 521 * Privileged processes may set the sticky bit on non-directories, 522 * as well as set the setgid bit on a file with a group that the 523 * process is not a member of. 524 */ 525 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 526 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 527 if (error) 528 return (EFTYPE); 529 } 530 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 531 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 532 if (error) 533 return (error); 534 } 535 ip->i_mode &= ~ALLPERMS; 536 ip->i_mode |= (mode & ALLPERMS); 537 ip->i_flag |= IN_CHANGE; 538 return (0); 539 } 540 541 /* 542 * Perform chown operation on inode ip; 543 * inode must be locked prior to call. 544 */ 545 static int 546 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 547 struct thread *td) 548 { 549 struct inode *ip = VTOI(vp); 550 uid_t ouid; 551 gid_t ogid; 552 int error = 0; 553 554 if (uid == (uid_t)VNOVAL) 555 uid = ip->i_uid; 556 if (gid == (gid_t)VNOVAL) 557 gid = ip->i_gid; 558 /* 559 * To modify the ownership of a file, must possess VADMIN 560 * for that file. 561 */ 562 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 563 return (error); 564 /* 565 * To change the owner of a file, or change the group of a file 566 * to a group of which we are not a member, the caller must 567 * have privilege. 568 */ 569 if (uid != ip->i_uid || (gid != ip->i_gid && 570 !groupmember(gid, cred))) { 571 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 572 if (error) 573 return (error); 574 } 575 ogid = ip->i_gid; 576 ouid = ip->i_uid; 577 ip->i_gid = gid; 578 ip->i_uid = uid; 579 ip->i_flag |= IN_CHANGE; 580 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 581 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 582 ip->i_mode &= ~(ISUID | ISGID); 583 } 584 return (0); 585 } 586 587 /* 588 * Synch an open file. 589 */ 590 /* ARGSUSED */ 591 static int 592 ext2_fsync(struct vop_fsync_args *ap) 593 { 594 /* 595 * Flush all dirty buffers associated with a vnode. 596 */ 597 598 vop_stdfsync(ap); 599 600 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 601 } 602 603 /* 604 * Mknod vnode call 605 */ 606 /* ARGSUSED */ 607 static int 608 ext2_mknod(struct vop_mknod_args *ap) 609 { 610 struct vattr *vap = ap->a_vap; 611 struct vnode **vpp = ap->a_vpp; 612 struct inode *ip; 613 ino_t ino; 614 int error; 615 616 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 617 ap->a_dvp, vpp, ap->a_cnp); 618 if (error) 619 return (error); 620 ip = VTOI(*vpp); 621 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 622 if (vap->va_rdev != VNOVAL) { 623 /* 624 * Want to be able to use this to make badblock 625 * inodes, so don't truncate the dev number. 626 */ 627 ip->i_rdev = vap->va_rdev; 628 } 629 /* 630 * Remove inode, then reload it through VFS_VGET so it is 631 * checked to see if it is an alias of an existing entry in 632 * the inode cache. XXX I don't believe this is necessary now. 633 */ 634 (*vpp)->v_type = VNON; 635 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 636 vgone(*vpp); 637 vput(*vpp); 638 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 639 if (error) { 640 *vpp = NULL; 641 return (error); 642 } 643 return (0); 644 } 645 646 static int 647 ext2_remove(struct vop_remove_args *ap) 648 { 649 struct inode *ip; 650 struct vnode *vp = ap->a_vp; 651 struct vnode *dvp = ap->a_dvp; 652 int error; 653 654 ip = VTOI(vp); 655 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 656 (VTOI(dvp)->i_flags & APPEND)) { 657 error = EPERM; 658 goto out; 659 } 660 error = ext2_dirremove(dvp, ap->a_cnp); 661 if (error == 0) { 662 ip->i_nlink--; 663 ip->i_flag |= IN_CHANGE; 664 } 665 out: 666 return (error); 667 } 668 669 /* 670 * link vnode call 671 */ 672 static int 673 ext2_link(struct vop_link_args *ap) 674 { 675 struct vnode *vp = ap->a_vp; 676 struct vnode *tdvp = ap->a_tdvp; 677 struct componentname *cnp = ap->a_cnp; 678 struct inode *ip; 679 int error; 680 681 #ifdef INVARIANTS 682 if ((cnp->cn_flags & HASBUF) == 0) 683 panic("ext2_link: no name"); 684 #endif 685 ip = VTOI(vp); 686 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) { 687 error = EMLINK; 688 goto out; 689 } 690 if (ip->i_flags & (IMMUTABLE | APPEND)) { 691 error = EPERM; 692 goto out; 693 } 694 ip->i_nlink++; 695 ip->i_flag |= IN_CHANGE; 696 error = ext2_update(vp, !DOINGASYNC(vp)); 697 if (!error) 698 error = ext2_direnter(ip, tdvp, cnp); 699 if (error) { 700 ip->i_nlink--; 701 ip->i_flag |= IN_CHANGE; 702 } 703 out: 704 return (error); 705 } 706 707 /* 708 * Rename system call. 709 * rename("foo", "bar"); 710 * is essentially 711 * unlink("bar"); 712 * link("foo", "bar"); 713 * unlink("foo"); 714 * but ``atomically''. Can't do full commit without saving state in the 715 * inode on disk which isn't feasible at this time. Best we can do is 716 * always guarantee the target exists. 717 * 718 * Basic algorithm is: 719 * 720 * 1) Bump link count on source while we're linking it to the 721 * target. This also ensure the inode won't be deleted out 722 * from underneath us while we work (it may be truncated by 723 * a concurrent `trunc' or `open' for creation). 724 * 2) Link source to destination. If destination already exists, 725 * delete it first. 726 * 3) Unlink source reference to inode if still around. If a 727 * directory was moved and the parent of the destination 728 * is different from the source, patch the ".." entry in the 729 * directory. 730 */ 731 static int 732 ext2_rename(struct vop_rename_args *ap) 733 { 734 struct vnode *tvp = ap->a_tvp; 735 struct vnode *tdvp = ap->a_tdvp; 736 struct vnode *fvp = ap->a_fvp; 737 struct vnode *fdvp = ap->a_fdvp; 738 struct componentname *tcnp = ap->a_tcnp; 739 struct componentname *fcnp = ap->a_fcnp; 740 struct inode *ip, *xp, *dp; 741 struct dirtemplate dirbuf; 742 int doingdirectory = 0, oldparent = 0, newparent = 0; 743 int error = 0; 744 u_char namlen; 745 746 #ifdef INVARIANTS 747 if ((tcnp->cn_flags & HASBUF) == 0 || 748 (fcnp->cn_flags & HASBUF) == 0) 749 panic("ext2_rename: no name"); 750 #endif 751 /* 752 * Check for cross-device rename. 753 */ 754 if ((fvp->v_mount != tdvp->v_mount) || 755 (tvp && (fvp->v_mount != tvp->v_mount))) { 756 error = EXDEV; 757 abortit: 758 if (tdvp == tvp) 759 vrele(tdvp); 760 else 761 vput(tdvp); 762 if (tvp) 763 vput(tvp); 764 vrele(fdvp); 765 vrele(fvp); 766 return (error); 767 } 768 769 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 770 (VTOI(tdvp)->i_flags & APPEND))) { 771 error = EPERM; 772 goto abortit; 773 } 774 775 /* 776 * Renaming a file to itself has no effect. The upper layers should 777 * not call us in that case. Temporarily just warn if they do. 778 */ 779 if (fvp == tvp) { 780 printf("ext2_rename: fvp == tvp (can't happen)\n"); 781 error = 0; 782 goto abortit; 783 } 784 785 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 786 goto abortit; 787 dp = VTOI(fdvp); 788 ip = VTOI(fvp); 789 if (ip->i_nlink >= EXT2_LINK_MAX) { 790 VOP_UNLOCK(fvp, 0); 791 error = EMLINK; 792 goto abortit; 793 } 794 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 795 || (dp->i_flags & APPEND)) { 796 VOP_UNLOCK(fvp, 0); 797 error = EPERM; 798 goto abortit; 799 } 800 if ((ip->i_mode & IFMT) == IFDIR) { 801 /* 802 * Avoid ".", "..", and aliases of "." for obvious reasons. 803 */ 804 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 805 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 806 (ip->i_flag & IN_RENAME)) { 807 VOP_UNLOCK(fvp, 0); 808 error = EINVAL; 809 goto abortit; 810 } 811 ip->i_flag |= IN_RENAME; 812 oldparent = dp->i_number; 813 doingdirectory++; 814 } 815 vrele(fdvp); 816 817 /* 818 * When the target exists, both the directory 819 * and target vnodes are returned locked. 820 */ 821 dp = VTOI(tdvp); 822 xp = NULL; 823 if (tvp) 824 xp = VTOI(tvp); 825 826 /* 827 * 1) Bump link count while we're moving stuff 828 * around. If we crash somewhere before 829 * completing our work, the link count 830 * may be wrong, but correctable. 831 */ 832 ip->i_nlink++; 833 ip->i_flag |= IN_CHANGE; 834 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 835 VOP_UNLOCK(fvp, 0); 836 goto bad; 837 } 838 839 /* 840 * If ".." must be changed (ie the directory gets a new 841 * parent) then the source directory must not be in the 842 * directory hierarchy above the target, as this would 843 * orphan everything below the source directory. Also 844 * the user must have write permission in the source so 845 * as to be able to change "..". We must repeat the call 846 * to namei, as the parent directory is unlocked by the 847 * call to checkpath(). 848 */ 849 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 850 VOP_UNLOCK(fvp, 0); 851 if (oldparent != dp->i_number) 852 newparent = dp->i_number; 853 if (doingdirectory && newparent) { 854 if (error) /* write access check above */ 855 goto bad; 856 if (xp != NULL) 857 vput(tvp); 858 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 859 if (error) 860 goto out; 861 VREF(tdvp); 862 error = relookup(tdvp, &tvp, tcnp); 863 if (error) 864 goto out; 865 vrele(tdvp); 866 dp = VTOI(tdvp); 867 xp = NULL; 868 if (tvp) 869 xp = VTOI(tvp); 870 } 871 /* 872 * 2) If target doesn't exist, link the target 873 * to the source and unlink the source. 874 * Otherwise, rewrite the target directory 875 * entry to reference the source inode and 876 * expunge the original entry's existence. 877 */ 878 if (xp == NULL) { 879 if (dp->i_devvp != ip->i_devvp) 880 panic("ext2_rename: EXDEV"); 881 /* 882 * Account for ".." in new directory. 883 * When source and destination have the same 884 * parent we don't fool with the link count. 885 */ 886 if (doingdirectory && newparent) { 887 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 888 error = EMLINK; 889 goto bad; 890 } 891 dp->i_nlink++; 892 dp->i_flag |= IN_CHANGE; 893 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 894 if (error) 895 goto bad; 896 } 897 error = ext2_direnter(ip, tdvp, tcnp); 898 if (error) { 899 if (doingdirectory && newparent) { 900 dp->i_nlink--; 901 dp->i_flag |= IN_CHANGE; 902 (void)ext2_update(tdvp, 1); 903 } 904 goto bad; 905 } 906 vput(tdvp); 907 } else { 908 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 909 panic("ext2_rename: EXDEV"); 910 /* 911 * Short circuit rename(foo, foo). 912 */ 913 if (xp->i_number == ip->i_number) 914 panic("ext2_rename: same file"); 915 /* 916 * If the parent directory is "sticky", then the user must 917 * own the parent directory, or the destination of the rename, 918 * otherwise the destination may not be changed (except by 919 * root). This implements append-only directories. 920 */ 921 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 922 tcnp->cn_cred->cr_uid != dp->i_uid && 923 xp->i_uid != tcnp->cn_cred->cr_uid) { 924 error = EPERM; 925 goto bad; 926 } 927 /* 928 * Target must be empty if a directory and have no links 929 * to it. Also, ensure source and target are compatible 930 * (both directories, or both not directories). 931 */ 932 if ((xp->i_mode & IFMT) == IFDIR) { 933 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 934 xp->i_nlink > 2) { 935 error = ENOTEMPTY; 936 goto bad; 937 } 938 if (!doingdirectory) { 939 error = ENOTDIR; 940 goto bad; 941 } 942 cache_purge(tdvp); 943 } else if (doingdirectory) { 944 error = EISDIR; 945 goto bad; 946 } 947 error = ext2_dirrewrite(dp, ip, tcnp); 948 if (error) 949 goto bad; 950 /* 951 * If the target directory is in the same 952 * directory as the source directory, 953 * decrement the link count on the parent 954 * of the target directory. 955 */ 956 if (doingdirectory && !newparent) { 957 dp->i_nlink--; 958 dp->i_flag |= IN_CHANGE; 959 } 960 vput(tdvp); 961 /* 962 * Adjust the link count of the target to 963 * reflect the dirrewrite above. If this is 964 * a directory it is empty and there are 965 * no links to it, so we can squash the inode and 966 * any space associated with it. We disallowed 967 * renaming over top of a directory with links to 968 * it above, as the remaining link would point to 969 * a directory without "." or ".." entries. 970 */ 971 xp->i_nlink--; 972 if (doingdirectory) { 973 if (--xp->i_nlink != 0) 974 panic("ext2_rename: linked directory"); 975 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 976 tcnp->cn_cred, tcnp->cn_thread); 977 } 978 xp->i_flag |= IN_CHANGE; 979 vput(tvp); 980 xp = NULL; 981 } 982 983 /* 984 * 3) Unlink the source. 985 */ 986 fcnp->cn_flags &= ~MODMASK; 987 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 988 VREF(fdvp); 989 error = relookup(fdvp, &fvp, fcnp); 990 if (error == 0) 991 vrele(fdvp); 992 if (fvp != NULL) { 993 xp = VTOI(fvp); 994 dp = VTOI(fdvp); 995 } else { 996 /* 997 * From name has disappeared. IN_RENAME is not sufficient 998 * to protect against directory races due to timing windows, 999 * so we can't panic here. 1000 */ 1001 vrele(ap->a_fvp); 1002 return (0); 1003 } 1004 /* 1005 * Ensure that the directory entry still exists and has not 1006 * changed while the new name has been entered. If the source is 1007 * a file then the entry may have been unlinked or renamed. In 1008 * either case there is no further work to be done. If the source 1009 * is a directory then it cannot have been rmdir'ed; its link 1010 * count of three would cause a rmdir to fail with ENOTEMPTY. 1011 * The IN_RENAME flag ensures that it cannot be moved by another 1012 * rename. 1013 */ 1014 if (xp != ip) { 1015 /* 1016 * From name resolves to a different inode. IN_RENAME is 1017 * not sufficient protection against timing window races 1018 * so we can't panic here. 1019 */ 1020 } else { 1021 /* 1022 * If the source is a directory with a 1023 * new parent, the link count of the old 1024 * parent directory must be decremented 1025 * and ".." set to point to the new parent. 1026 */ 1027 if (doingdirectory && newparent) { 1028 dp->i_nlink--; 1029 dp->i_flag |= IN_CHANGE; 1030 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1031 sizeof(struct dirtemplate), (off_t)0, 1032 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1033 tcnp->cn_cred, NOCRED, NULL, NULL); 1034 if (error == 0) { 1035 /* Like ufs little-endian: */ 1036 namlen = dirbuf.dotdot_type; 1037 if (namlen != 2 || 1038 dirbuf.dotdot_name[0] != '.' || 1039 dirbuf.dotdot_name[1] != '.') { 1040 ext2_dirbad(xp, (doff_t)12, 1041 "rename: mangled dir"); 1042 } else { 1043 dirbuf.dotdot_ino = newparent; 1044 (void)vn_rdwr(UIO_WRITE, fvp, 1045 (caddr_t)&dirbuf, 1046 sizeof(struct dirtemplate), 1047 (off_t)0, UIO_SYSSPACE, 1048 IO_NODELOCKED | IO_SYNC | 1049 IO_NOMACCHECK, tcnp->cn_cred, 1050 NOCRED, NULL, NULL); 1051 cache_purge(fdvp); 1052 } 1053 } 1054 } 1055 error = ext2_dirremove(fdvp, fcnp); 1056 if (!error) { 1057 xp->i_nlink--; 1058 xp->i_flag |= IN_CHANGE; 1059 } 1060 xp->i_flag &= ~IN_RENAME; 1061 } 1062 if (dp) 1063 vput(fdvp); 1064 if (xp) 1065 vput(fvp); 1066 vrele(ap->a_fvp); 1067 return (error); 1068 1069 bad: 1070 if (xp) 1071 vput(ITOV(xp)); 1072 vput(ITOV(dp)); 1073 out: 1074 if (doingdirectory) 1075 ip->i_flag &= ~IN_RENAME; 1076 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1077 ip->i_nlink--; 1078 ip->i_flag |= IN_CHANGE; 1079 ip->i_flag &= ~IN_RENAME; 1080 vput(fvp); 1081 } else 1082 vrele(fvp); 1083 return (error); 1084 } 1085 1086 /* 1087 * Mkdir system call 1088 */ 1089 static int 1090 ext2_mkdir(struct vop_mkdir_args *ap) 1091 { 1092 struct vnode *dvp = ap->a_dvp; 1093 struct vattr *vap = ap->a_vap; 1094 struct componentname *cnp = ap->a_cnp; 1095 struct inode *ip, *dp; 1096 struct vnode *tvp; 1097 struct dirtemplate dirtemplate, *dtp; 1098 int error, dmode; 1099 1100 #ifdef INVARIANTS 1101 if ((cnp->cn_flags & HASBUF) == 0) 1102 panic("ext2_mkdir: no name"); 1103 #endif 1104 dp = VTOI(dvp); 1105 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 1106 error = EMLINK; 1107 goto out; 1108 } 1109 dmode = vap->va_mode & 0777; 1110 dmode |= IFDIR; 1111 /* 1112 * Must simulate part of ext2_makeinode here to acquire the inode, 1113 * but not have it entered in the parent directory. The entry is 1114 * made later after writing "." and ".." entries. 1115 */ 1116 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1117 if (error) 1118 goto out; 1119 ip = VTOI(tvp); 1120 ip->i_gid = dp->i_gid; 1121 #ifdef SUIDDIR 1122 { 1123 /* 1124 * if we are hacking owners here, (only do this where told to) 1125 * and we are not giving it TOO root, (would subvert quotas) 1126 * then go ahead and give it to the other user. 1127 * The new directory also inherits the SUID bit. 1128 * If user's UID and dir UID are the same, 1129 * 'give it away' so that the SUID is still forced on. 1130 */ 1131 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1132 (dp->i_mode & ISUID) && dp->i_uid) { 1133 dmode |= ISUID; 1134 ip->i_uid = dp->i_uid; 1135 } else { 1136 ip->i_uid = cnp->cn_cred->cr_uid; 1137 } 1138 } 1139 #else 1140 ip->i_uid = cnp->cn_cred->cr_uid; 1141 #endif 1142 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1143 ip->i_mode = dmode; 1144 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1145 ip->i_nlink = 2; 1146 if (cnp->cn_flags & ISWHITEOUT) 1147 ip->i_flags |= UF_OPAQUE; 1148 error = ext2_update(tvp, 1); 1149 1150 /* 1151 * Bump link count in parent directory 1152 * to reflect work done below. Should 1153 * be done before reference is created 1154 * so reparation is possible if we crash. 1155 */ 1156 dp->i_nlink++; 1157 dp->i_flag |= IN_CHANGE; 1158 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1159 if (error) 1160 goto bad; 1161 1162 /* Initialize directory with "." and ".." from static template. */ 1163 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1164 EXT2F_INCOMPAT_FTYPE)) 1165 dtp = &mastertemplate; 1166 else 1167 dtp = &omastertemplate; 1168 dirtemplate = *dtp; 1169 dirtemplate.dot_ino = ip->i_number; 1170 dirtemplate.dotdot_ino = dp->i_number; 1171 /* 1172 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1173 * just redefine it - for this function only 1174 */ 1175 #undef DIRBLKSIZ 1176 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1177 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1178 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1179 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE, 1180 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1181 NULL, NULL); 1182 if (error) { 1183 dp->i_nlink--; 1184 dp->i_flag |= IN_CHANGE; 1185 goto bad; 1186 } 1187 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1188 /* XXX should grow with balloc() */ 1189 panic("ext2_mkdir: blksize"); 1190 else { 1191 ip->i_size = DIRBLKSIZ; 1192 ip->i_flag |= IN_CHANGE; 1193 } 1194 1195 /* Directory set up, now install its entry in the parent directory. */ 1196 error = ext2_direnter(ip, dvp, cnp); 1197 if (error) { 1198 dp->i_nlink--; 1199 dp->i_flag |= IN_CHANGE; 1200 } 1201 bad: 1202 /* 1203 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1204 * for us because we set the link count to 0. 1205 */ 1206 if (error) { 1207 ip->i_nlink = 0; 1208 ip->i_flag |= IN_CHANGE; 1209 vput(tvp); 1210 } else 1211 *ap->a_vpp = tvp; 1212 out: 1213 return (error); 1214 #undef DIRBLKSIZ 1215 #define DIRBLKSIZ DEV_BSIZE 1216 } 1217 1218 /* 1219 * Rmdir system call. 1220 */ 1221 static int 1222 ext2_rmdir(struct vop_rmdir_args *ap) 1223 { 1224 struct vnode *vp = ap->a_vp; 1225 struct vnode *dvp = ap->a_dvp; 1226 struct componentname *cnp = ap->a_cnp; 1227 struct inode *ip, *dp; 1228 int error; 1229 1230 ip = VTOI(vp); 1231 dp = VTOI(dvp); 1232 1233 /* 1234 * Verify the directory is empty (and valid). 1235 * (Rmdir ".." won't be valid since 1236 * ".." will contain a reference to 1237 * the current directory and thus be 1238 * non-empty.) 1239 */ 1240 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1241 error = ENOTEMPTY; 1242 goto out; 1243 } 1244 if ((dp->i_flags & APPEND) 1245 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1246 error = EPERM; 1247 goto out; 1248 } 1249 /* 1250 * Delete reference to directory before purging 1251 * inode. If we crash in between, the directory 1252 * will be reattached to lost+found, 1253 */ 1254 error = ext2_dirremove(dvp, cnp); 1255 if (error) 1256 goto out; 1257 dp->i_nlink--; 1258 dp->i_flag |= IN_CHANGE; 1259 cache_purge(dvp); 1260 VOP_UNLOCK(dvp, 0); 1261 /* 1262 * Truncate inode. The only stuff left 1263 * in the directory is "." and "..". The 1264 * "." reference is inconsequential since 1265 * we're quashing it. The ".." reference 1266 * has already been adjusted above. We've 1267 * removed the "." reference and the reference 1268 * in the parent directory, but there may be 1269 * other hard links so decrement by 2 and 1270 * worry about them later. 1271 */ 1272 ip->i_nlink -= 2; 1273 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1274 cnp->cn_thread); 1275 cache_purge(ITOV(ip)); 1276 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1277 VOP_UNLOCK(vp, 0); 1278 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1279 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1280 } 1281 out: 1282 return (error); 1283 } 1284 1285 /* 1286 * symlink -- make a symbolic link 1287 */ 1288 static int 1289 ext2_symlink(struct vop_symlink_args *ap) 1290 { 1291 struct vnode *vp, **vpp = ap->a_vpp; 1292 struct inode *ip; 1293 int len, error; 1294 1295 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1296 vpp, ap->a_cnp); 1297 if (error) 1298 return (error); 1299 vp = *vpp; 1300 len = strlen(ap->a_target); 1301 if (len < vp->v_mount->mnt_maxsymlinklen) { 1302 ip = VTOI(vp); 1303 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1304 ip->i_size = len; 1305 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1306 } else 1307 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1308 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1309 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1310 if (error) 1311 vput(vp); 1312 return (error); 1313 } 1314 1315 /* 1316 * Return target name of a symbolic link 1317 */ 1318 static int 1319 ext2_readlink(struct vop_readlink_args *ap) 1320 { 1321 struct vnode *vp = ap->a_vp; 1322 struct inode *ip = VTOI(vp); 1323 int isize; 1324 1325 isize = ip->i_size; 1326 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1327 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1328 return (0); 1329 } 1330 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1331 } 1332 1333 /* 1334 * Calculate the logical to physical mapping if not done already, 1335 * then call the device strategy routine. 1336 * 1337 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1338 * deadlock on memory. See ext2_bmap() for details. 1339 */ 1340 static int 1341 ext2_strategy(struct vop_strategy_args *ap) 1342 { 1343 struct buf *bp = ap->a_bp; 1344 struct vnode *vp = ap->a_vp; 1345 struct bufobj *bo; 1346 daddr_t blkno; 1347 int error; 1348 1349 if (vp->v_type == VBLK || vp->v_type == VCHR) 1350 panic("ext2_strategy: spec"); 1351 if (bp->b_blkno == bp->b_lblkno) { 1352 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1353 bp->b_blkno = blkno; 1354 if (error) { 1355 bp->b_error = error; 1356 bp->b_ioflags |= BIO_ERROR; 1357 bufdone(bp); 1358 return (0); 1359 } 1360 if ((long)bp->b_blkno == -1) 1361 vfs_bio_clrbuf(bp); 1362 } 1363 if ((long)bp->b_blkno == -1) { 1364 bufdone(bp); 1365 return (0); 1366 } 1367 bp->b_iooffset = dbtob(bp->b_blkno); 1368 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1369 BO_STRATEGY(bo, bp); 1370 return (0); 1371 } 1372 1373 /* 1374 * Print out the contents of an inode. 1375 */ 1376 static int 1377 ext2_print(struct vop_print_args *ap) 1378 { 1379 struct vnode *vp = ap->a_vp; 1380 struct inode *ip = VTOI(vp); 1381 1382 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1383 if (vp->v_type == VFIFO) 1384 fifo_printinfo(vp); 1385 printf("\n"); 1386 return (0); 1387 } 1388 1389 /* 1390 * Close wrapper for fifos. 1391 * 1392 * Update the times on the inode then do device close. 1393 */ 1394 static int 1395 ext2fifo_close(struct vop_close_args *ap) 1396 { 1397 struct vnode *vp = ap->a_vp; 1398 1399 VI_LOCK(vp); 1400 if (vp->v_usecount > 1) 1401 ext2_itimes_locked(vp); 1402 VI_UNLOCK(vp); 1403 return (fifo_specops.vop_close(ap)); 1404 } 1405 1406 /* 1407 * Kqfilter wrapper for fifos. 1408 * 1409 * Fall through to ext2 kqfilter routines if needed 1410 */ 1411 static int 1412 ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1413 { 1414 int error; 1415 1416 error = fifo_specops.vop_kqfilter(ap); 1417 if (error) 1418 error = vfs_kqfilter(ap); 1419 return (error); 1420 } 1421 1422 /* 1423 * Return POSIX pathconf information applicable to ext2 filesystems. 1424 */ 1425 static int 1426 ext2_pathconf(struct vop_pathconf_args *ap) 1427 { 1428 int error = 0; 1429 1430 switch (ap->a_name) { 1431 case _PC_LINK_MAX: 1432 *ap->a_retval = EXT2_LINK_MAX; 1433 break; 1434 case _PC_NAME_MAX: 1435 *ap->a_retval = NAME_MAX; 1436 break; 1437 case _PC_PATH_MAX: 1438 *ap->a_retval = PATH_MAX; 1439 break; 1440 case _PC_PIPE_BUF: 1441 *ap->a_retval = PIPE_BUF; 1442 break; 1443 case _PC_CHOWN_RESTRICTED: 1444 *ap->a_retval = 1; 1445 break; 1446 case _PC_NO_TRUNC: 1447 *ap->a_retval = 1; 1448 break; 1449 case _PC_MIN_HOLE_SIZE: 1450 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1451 break; 1452 case _PC_ASYNC_IO: 1453 /* _PC_ASYNC_IO should have been handled by upper layers. */ 1454 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 1455 error = EINVAL; 1456 break; 1457 case _PC_PRIO_IO: 1458 *ap->a_retval = 0; 1459 break; 1460 case _PC_SYNC_IO: 1461 *ap->a_retval = 0; 1462 break; 1463 case _PC_ALLOC_SIZE_MIN: 1464 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1465 break; 1466 case _PC_FILESIZEBITS: 1467 *ap->a_retval = 64; 1468 break; 1469 case _PC_REC_INCR_XFER_SIZE: 1470 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1471 break; 1472 case _PC_REC_MAX_XFER_SIZE: 1473 *ap->a_retval = -1; /* means ``unlimited'' */ 1474 break; 1475 case _PC_REC_MIN_XFER_SIZE: 1476 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1477 break; 1478 case _PC_REC_XFER_ALIGN: 1479 *ap->a_retval = PAGE_SIZE; 1480 break; 1481 case _PC_SYMLINK_MAX: 1482 *ap->a_retval = MAXPATHLEN; 1483 break; 1484 1485 default: 1486 error = EINVAL; 1487 break; 1488 } 1489 return (error); 1490 } 1491 1492 /* 1493 * Vnode operation to remove a named attribute. 1494 */ 1495 static int 1496 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1497 { 1498 struct inode *ip; 1499 struct m_ext2fs *fs; 1500 int error; 1501 1502 ip = VTOI(ap->a_vp); 1503 fs = ip->i_e2fs; 1504 1505 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1506 return (EOPNOTSUPP); 1507 1508 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1509 return (EOPNOTSUPP); 1510 1511 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1512 ap->a_cred, ap->a_td, VWRITE); 1513 if (error) 1514 return (error); 1515 1516 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1517 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1518 if (error != ENOATTR) 1519 return (error); 1520 } 1521 1522 if (ip->i_facl) 1523 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1524 1525 return (error); 1526 } 1527 1528 /* 1529 * Vnode operation to retrieve a named extended attribute. 1530 */ 1531 static int 1532 ext2_getextattr(struct vop_getextattr_args *ap) 1533 { 1534 struct inode *ip; 1535 struct m_ext2fs *fs; 1536 int error; 1537 1538 ip = VTOI(ap->a_vp); 1539 fs = ip->i_e2fs; 1540 1541 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1542 return (EOPNOTSUPP); 1543 1544 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1545 return (EOPNOTSUPP); 1546 1547 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1548 ap->a_cred, ap->a_td, VREAD); 1549 if (error) 1550 return (error); 1551 1552 if (ap->a_size != NULL) 1553 *ap->a_size = 0; 1554 1555 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1556 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1557 ap->a_name, ap->a_uio, ap->a_size); 1558 if (error != ENOATTR) 1559 return (error); 1560 } 1561 1562 if (ip->i_facl) 1563 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1564 ap->a_name, ap->a_uio, ap->a_size); 1565 1566 return (error); 1567 } 1568 1569 /* 1570 * Vnode operation to retrieve extended attributes on a vnode. 1571 */ 1572 static int 1573 ext2_listextattr(struct vop_listextattr_args *ap) 1574 { 1575 struct inode *ip; 1576 struct m_ext2fs *fs; 1577 int error; 1578 1579 ip = VTOI(ap->a_vp); 1580 fs = ip->i_e2fs; 1581 1582 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1583 return (EOPNOTSUPP); 1584 1585 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1586 return (EOPNOTSUPP); 1587 1588 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1589 ap->a_cred, ap->a_td, VREAD); 1590 if (error) 1591 return (error); 1592 1593 if (ap->a_size != NULL) 1594 *ap->a_size = 0; 1595 1596 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1597 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1598 ap->a_uio, ap->a_size); 1599 if (error) 1600 return (error); 1601 } 1602 1603 if (ip->i_facl) 1604 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1605 ap->a_uio, ap->a_size); 1606 1607 return (error); 1608 } 1609 1610 /* 1611 * Vnode operation to set a named attribute. 1612 */ 1613 static int 1614 ext2_setextattr(struct vop_setextattr_args *ap) 1615 { 1616 struct inode *ip; 1617 struct m_ext2fs *fs; 1618 int error; 1619 1620 ip = VTOI(ap->a_vp); 1621 fs = ip->i_e2fs; 1622 1623 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1624 return (EOPNOTSUPP); 1625 1626 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1627 return (EOPNOTSUPP); 1628 1629 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1630 ap->a_cred, ap->a_td, VWRITE); 1631 if (error) 1632 return (error); 1633 1634 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1635 if (error) 1636 return (error); 1637 1638 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1639 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1640 ap->a_name, ap->a_uio); 1641 if (error != ENOSPC) 1642 return (error); 1643 } 1644 1645 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1646 ap->a_name, ap->a_uio); 1647 1648 return (error); 1649 } 1650 1651 /* 1652 * Vnode pointer to File handle 1653 */ 1654 /* ARGSUSED */ 1655 static int 1656 ext2_vptofh(struct vop_vptofh_args *ap) 1657 { 1658 struct inode *ip; 1659 struct ufid *ufhp; 1660 1661 ip = VTOI(ap->a_vp); 1662 ufhp = (struct ufid *)ap->a_fhp; 1663 ufhp->ufid_len = sizeof(struct ufid); 1664 ufhp->ufid_ino = ip->i_number; 1665 ufhp->ufid_gen = ip->i_gen; 1666 return (0); 1667 } 1668 1669 /* 1670 * Initialize the vnode associated with a new inode, handle aliased 1671 * vnodes. 1672 */ 1673 int 1674 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1675 { 1676 struct inode *ip; 1677 struct vnode *vp; 1678 1679 vp = *vpp; 1680 ip = VTOI(vp); 1681 vp->v_type = IFTOVT(ip->i_mode); 1682 if (vp->v_type == VFIFO) 1683 vp->v_op = fifoops; 1684 1685 if (ip->i_number == EXT2_ROOTINO) 1686 vp->v_vflag |= VV_ROOT; 1687 ip->i_modrev = init_va_filerev(); 1688 *vpp = vp; 1689 return (0); 1690 } 1691 1692 /* 1693 * Allocate a new inode. 1694 */ 1695 static int 1696 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1697 struct componentname *cnp) 1698 { 1699 struct inode *ip, *pdir; 1700 struct vnode *tvp; 1701 int error; 1702 1703 pdir = VTOI(dvp); 1704 #ifdef INVARIANTS 1705 if ((cnp->cn_flags & HASBUF) == 0) 1706 panic("ext2_makeinode: no name"); 1707 #endif 1708 *vpp = NULL; 1709 if ((mode & IFMT) == 0) 1710 mode |= IFREG; 1711 1712 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1713 if (error) { 1714 return (error); 1715 } 1716 ip = VTOI(tvp); 1717 ip->i_gid = pdir->i_gid; 1718 #ifdef SUIDDIR 1719 { 1720 /* 1721 * if we are 1722 * not the owner of the directory, 1723 * and we are hacking owners here, (only do this where told to) 1724 * and we are not giving it TOO root, (would subvert quotas) 1725 * then go ahead and give it to the other user. 1726 * Note that this drops off the execute bits for security. 1727 */ 1728 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1729 (pdir->i_mode & ISUID) && 1730 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1731 ip->i_uid = pdir->i_uid; 1732 mode &= ~07111; 1733 } else { 1734 ip->i_uid = cnp->cn_cred->cr_uid; 1735 } 1736 } 1737 #else 1738 ip->i_uid = cnp->cn_cred->cr_uid; 1739 #endif 1740 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1741 ip->i_mode = mode; 1742 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1743 ip->i_nlink = 1; 1744 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1745 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1746 ip->i_mode &= ~ISGID; 1747 } 1748 1749 if (cnp->cn_flags & ISWHITEOUT) 1750 ip->i_flags |= UF_OPAQUE; 1751 1752 /* 1753 * Make sure inode goes to disk before directory entry. 1754 */ 1755 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1756 if (error) 1757 goto bad; 1758 error = ext2_direnter(ip, dvp, cnp); 1759 if (error) 1760 goto bad; 1761 1762 *vpp = tvp; 1763 return (0); 1764 1765 bad: 1766 /* 1767 * Write error occurred trying to update the inode 1768 * or the directory so must deallocate the inode. 1769 */ 1770 ip->i_nlink = 0; 1771 ip->i_flag |= IN_CHANGE; 1772 vput(tvp); 1773 return (error); 1774 } 1775 1776 /* 1777 * Vnode op for reading. 1778 */ 1779 static int 1780 ext2_read(struct vop_read_args *ap) 1781 { 1782 struct vnode *vp; 1783 struct inode *ip; 1784 int error; 1785 1786 vp = ap->a_vp; 1787 ip = VTOI(vp); 1788 1789 /* EXT4_EXT_LOCK(ip); */ 1790 if (ip->i_flag & IN_E4EXTENTS) 1791 error = ext4_ext_read(ap); 1792 else 1793 error = ext2_ind_read(ap); 1794 /* EXT4_EXT_UNLOCK(ip); */ 1795 return (error); 1796 } 1797 1798 /* 1799 * Vnode op for reading. 1800 */ 1801 static int 1802 ext2_ind_read(struct vop_read_args *ap) 1803 { 1804 struct vnode *vp; 1805 struct inode *ip; 1806 struct uio *uio; 1807 struct m_ext2fs *fs; 1808 struct buf *bp; 1809 daddr_t lbn, nextlbn; 1810 off_t bytesinfile; 1811 long size, xfersize, blkoffset; 1812 int error, orig_resid, seqcount; 1813 int ioflag; 1814 1815 vp = ap->a_vp; 1816 uio = ap->a_uio; 1817 ioflag = ap->a_ioflag; 1818 1819 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 1820 ip = VTOI(vp); 1821 1822 #ifdef INVARIANTS 1823 if (uio->uio_rw != UIO_READ) 1824 panic("%s: mode", "ext2_read"); 1825 1826 if (vp->v_type == VLNK) { 1827 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 1828 panic("%s: short symlink", "ext2_read"); 1829 } else if (vp->v_type != VREG && vp->v_type != VDIR) 1830 panic("%s: type %d", "ext2_read", vp->v_type); 1831 #endif 1832 orig_resid = uio->uio_resid; 1833 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 1834 if (orig_resid == 0) 1835 return (0); 1836 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 1837 fs = ip->i_e2fs; 1838 if (uio->uio_offset < ip->i_size && 1839 uio->uio_offset >= fs->e2fs_maxfilesize) 1840 return (EOVERFLOW); 1841 1842 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1843 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1844 break; 1845 lbn = lblkno(fs, uio->uio_offset); 1846 nextlbn = lbn + 1; 1847 size = blksize(fs, ip, lbn); 1848 blkoffset = blkoff(fs, uio->uio_offset); 1849 1850 xfersize = fs->e2fs_fsize - blkoffset; 1851 if (uio->uio_resid < xfersize) 1852 xfersize = uio->uio_resid; 1853 if (bytesinfile < xfersize) 1854 xfersize = bytesinfile; 1855 1856 if (lblktosize(fs, nextlbn) >= ip->i_size) 1857 error = bread(vp, lbn, size, NOCRED, &bp); 1858 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 1859 error = cluster_read(vp, ip->i_size, lbn, size, 1860 NOCRED, blkoffset + uio->uio_resid, seqcount, 1861 0, &bp); 1862 } else if (seqcount > 1) { 1863 u_int nextsize = blksize(fs, ip, nextlbn); 1864 1865 error = breadn(vp, lbn, 1866 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1867 } else 1868 error = bread(vp, lbn, size, NOCRED, &bp); 1869 if (error) { 1870 brelse(bp); 1871 bp = NULL; 1872 break; 1873 } 1874 1875 /* 1876 * We should only get non-zero b_resid when an I/O error 1877 * has occurred, which should cause us to break above. 1878 * However, if the short read did not cause an error, 1879 * then we want to ensure that we do not uiomove bad 1880 * or uninitialized data. 1881 */ 1882 size -= bp->b_resid; 1883 if (size < xfersize) { 1884 if (size == 0) 1885 break; 1886 xfersize = size; 1887 } 1888 error = uiomove((char *)bp->b_data + blkoffset, 1889 (int)xfersize, uio); 1890 if (error) 1891 break; 1892 vfs_bio_brelse(bp, ioflag); 1893 } 1894 1895 /* 1896 * This can only happen in the case of an error because the loop 1897 * above resets bp to NULL on each iteration and on normal 1898 * completion has not set a new value into it. so it must have come 1899 * from a 'break' statement 1900 */ 1901 if (bp != NULL) 1902 vfs_bio_brelse(bp, ioflag); 1903 1904 if ((error == 0 || uio->uio_resid != orig_resid) && 1905 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 1906 ip->i_flag |= IN_ACCESS; 1907 return (error); 1908 } 1909 1910 static int 1911 ext2_ioctl(struct vop_ioctl_args *ap) 1912 { 1913 1914 switch (ap->a_command) { 1915 case FIOSEEKDATA: 1916 case FIOSEEKHOLE: 1917 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 1918 (off_t *)ap->a_data, ap->a_cred)); 1919 default: 1920 return (ENOTTY); 1921 } 1922 } 1923 1924 /* 1925 * this function handles ext4 extents block mapping 1926 */ 1927 static int 1928 ext4_ext_read(struct vop_read_args *ap) 1929 { 1930 static unsigned char zeroes[EXT2_MAX_BLOCK_SIZE]; 1931 struct vnode *vp; 1932 struct inode *ip; 1933 struct uio *uio; 1934 struct m_ext2fs *fs; 1935 struct buf *bp; 1936 struct ext4_extent nex, *ep; 1937 struct ext4_extent_path path; 1938 daddr_t lbn, newblk; 1939 off_t bytesinfile; 1940 int cache_type; 1941 ssize_t orig_resid; 1942 int error; 1943 long size, xfersize, blkoffset; 1944 1945 vp = ap->a_vp; 1946 ip = VTOI(vp); 1947 uio = ap->a_uio; 1948 memset(&path, 0, sizeof(path)); 1949 1950 orig_resid = uio->uio_resid; 1951 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__)); 1952 if (orig_resid == 0) 1953 return (0); 1954 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__)); 1955 fs = ip->i_e2fs; 1956 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize) 1957 return (EOVERFLOW); 1958 1959 while (uio->uio_resid > 0) { 1960 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1961 break; 1962 lbn = lblkno(fs, uio->uio_offset); 1963 size = blksize(fs, ip, lbn); 1964 blkoffset = blkoff(fs, uio->uio_offset); 1965 1966 xfersize = fs->e2fs_fsize - blkoffset; 1967 xfersize = MIN(xfersize, uio->uio_resid); 1968 xfersize = MIN(xfersize, bytesinfile); 1969 1970 /* get block from ext4 extent cache */ 1971 cache_type = ext4_ext_in_cache(ip, lbn, &nex); 1972 switch (cache_type) { 1973 case EXT4_EXT_CACHE_NO: 1974 ext4_ext_find_extent(fs, ip, lbn, &path); 1975 if (path.ep_is_sparse) 1976 ep = &path.ep_sparse_ext; 1977 else 1978 ep = path.ep_ext; 1979 if (ep == NULL) 1980 return (EIO); 1981 1982 ext4_ext_put_cache(ip, ep, 1983 path.ep_is_sparse ? EXT4_EXT_CACHE_GAP : EXT4_EXT_CACHE_IN); 1984 1985 newblk = lbn - ep->e_blk + (ep->e_start_lo | 1986 (daddr_t)ep->e_start_hi << 32); 1987 1988 if (path.ep_bp != NULL) { 1989 brelse(path.ep_bp); 1990 path.ep_bp = NULL; 1991 } 1992 break; 1993 1994 case EXT4_EXT_CACHE_GAP: 1995 /* block has not been allocated yet */ 1996 break; 1997 1998 case EXT4_EXT_CACHE_IN: 1999 newblk = lbn - nex.e_blk + (nex.e_start_lo | 2000 (daddr_t)nex.e_start_hi << 32); 2001 break; 2002 2003 default: 2004 panic("%s: invalid cache type", __func__); 2005 } 2006 2007 if (cache_type == EXT4_EXT_CACHE_GAP || 2008 (cache_type == EXT4_EXT_CACHE_NO && path.ep_is_sparse)) { 2009 if (xfersize > sizeof(zeroes)) 2010 xfersize = sizeof(zeroes); 2011 error = uiomove(zeroes, xfersize, uio); 2012 if (error) 2013 return (error); 2014 } else { 2015 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, 2016 NOCRED, &bp); 2017 if (error) { 2018 brelse(bp); 2019 return (error); 2020 } 2021 2022 size -= bp->b_resid; 2023 if (size < xfersize) { 2024 if (size == 0) { 2025 bqrelse(bp); 2026 break; 2027 } 2028 xfersize = size; 2029 } 2030 error = uiomove(bp->b_data + blkoffset, xfersize, uio); 2031 bqrelse(bp); 2032 if (error) 2033 return (error); 2034 } 2035 } 2036 2037 return (0); 2038 } 2039 2040 /* 2041 * Vnode op for writing. 2042 */ 2043 static int 2044 ext2_write(struct vop_write_args *ap) 2045 { 2046 struct vnode *vp; 2047 struct uio *uio; 2048 struct inode *ip; 2049 struct m_ext2fs *fs; 2050 struct buf *bp; 2051 daddr_t lbn; 2052 off_t osize; 2053 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2054 2055 ioflag = ap->a_ioflag; 2056 uio = ap->a_uio; 2057 vp = ap->a_vp; 2058 2059 seqcount = ioflag >> IO_SEQSHIFT; 2060 ip = VTOI(vp); 2061 2062 #ifdef INVARIANTS 2063 if (uio->uio_rw != UIO_WRITE) 2064 panic("%s: mode", "ext2_write"); 2065 #endif 2066 2067 switch (vp->v_type) { 2068 case VREG: 2069 if (ioflag & IO_APPEND) 2070 uio->uio_offset = ip->i_size; 2071 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2072 return (EPERM); 2073 /* FALLTHROUGH */ 2074 case VLNK: 2075 break; 2076 case VDIR: 2077 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2078 if ((ioflag & IO_SYNC) == 0) 2079 panic("ext2_write: nonsync dir write"); 2080 break; 2081 default: 2082 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2083 vp->v_type, (intmax_t)uio->uio_offset, 2084 (intmax_t)uio->uio_resid); 2085 } 2086 2087 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2088 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2089 fs = ip->i_e2fs; 2090 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2091 return (EFBIG); 2092 /* 2093 * Maybe this should be above the vnode op call, but so long as 2094 * file servers have no limits, I don't think it matters. 2095 */ 2096 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 2097 return (EFBIG); 2098 2099 resid = uio->uio_resid; 2100 osize = ip->i_size; 2101 if (seqcount > BA_SEQMAX) 2102 flags = BA_SEQMAX << BA_SEQSHIFT; 2103 else 2104 flags = seqcount << BA_SEQSHIFT; 2105 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2106 flags |= IO_SYNC; 2107 2108 for (error = 0; uio->uio_resid > 0;) { 2109 lbn = lblkno(fs, uio->uio_offset); 2110 blkoffset = blkoff(fs, uio->uio_offset); 2111 xfersize = fs->e2fs_fsize - blkoffset; 2112 if (uio->uio_resid < xfersize) 2113 xfersize = uio->uio_resid; 2114 if (uio->uio_offset + xfersize > ip->i_size) 2115 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2116 2117 /* 2118 * We must perform a read-before-write if the transfer size 2119 * does not cover the entire buffer. 2120 */ 2121 if (fs->e2fs_bsize > xfersize) 2122 flags |= BA_CLRBUF; 2123 else 2124 flags &= ~BA_CLRBUF; 2125 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2126 ap->a_cred, &bp, flags); 2127 if (error != 0) 2128 break; 2129 2130 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2131 bp->b_flags |= B_NOCACHE; 2132 if (uio->uio_offset + xfersize > ip->i_size) 2133 ip->i_size = uio->uio_offset + xfersize; 2134 size = blksize(fs, ip, lbn) - bp->b_resid; 2135 if (size < xfersize) 2136 xfersize = size; 2137 2138 error = 2139 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2140 /* 2141 * If the buffer is not already filled and we encounter an 2142 * error while trying to fill it, we have to clear out any 2143 * garbage data from the pages instantiated for the buffer. 2144 * If we do not, a failed uiomove() during a write can leave 2145 * the prior contents of the pages exposed to a userland mmap. 2146 * 2147 * Note that we need only clear buffers with a transfer size 2148 * equal to the block size because buffers with a shorter 2149 * transfer size were cleared above by the call to ext2_balloc() 2150 * with the BA_CLRBUF flag set. 2151 * 2152 * If the source region for uiomove identically mmaps the 2153 * buffer, uiomove() performed the NOP copy, and the buffer 2154 * content remains valid because the page fault handler 2155 * validated the pages. 2156 */ 2157 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2158 fs->e2fs_bsize == xfersize) 2159 vfs_bio_clrbuf(bp); 2160 2161 vfs_bio_set_flags(bp, ioflag); 2162 2163 /* 2164 * If IO_SYNC each buffer is written synchronously. Otherwise 2165 * if we have a severe page deficiency write the buffer 2166 * asynchronously. Otherwise try to cluster, and if that 2167 * doesn't do it then either do an async write (if O_DIRECT), 2168 * or a delayed write (if not). 2169 */ 2170 if (ioflag & IO_SYNC) { 2171 (void)bwrite(bp); 2172 } else if (vm_page_count_severe() || 2173 buf_dirty_count_severe() || 2174 (ioflag & IO_ASYNC)) { 2175 bp->b_flags |= B_CLUSTEROK; 2176 bawrite(bp); 2177 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2178 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2179 bp->b_flags |= B_CLUSTEROK; 2180 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2181 } else { 2182 bawrite(bp); 2183 } 2184 } else if (ioflag & IO_DIRECT) { 2185 bp->b_flags |= B_CLUSTEROK; 2186 bawrite(bp); 2187 } else { 2188 bp->b_flags |= B_CLUSTEROK; 2189 bdwrite(bp); 2190 } 2191 if (error || xfersize == 0) 2192 break; 2193 } 2194 /* 2195 * If we successfully wrote any data, and we are not the superuser 2196 * we clear the setuid and setgid bits as a precaution against 2197 * tampering. 2198 */ 2199 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2200 ap->a_cred) { 2201 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 2202 ip->i_mode &= ~(ISUID | ISGID); 2203 } 2204 if (error) { 2205 if (ioflag & IO_UNIT) { 2206 (void)ext2_truncate(vp, osize, 2207 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2208 uio->uio_offset -= resid - uio->uio_resid; 2209 uio->uio_resid = resid; 2210 } 2211 } 2212 if (uio->uio_resid != resid) { 2213 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2214 if (ioflag & IO_SYNC) 2215 error = ext2_update(vp, 1); 2216 } 2217 return (error); 2218 } 2219